From patchwork Fri Aug 4 14:31:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 109412 Delivered-To: patch@linaro.org Received: by 10.140.101.6 with SMTP id t6csp2235100qge; Fri, 4 Aug 2017 07:32:57 -0700 (PDT) X-Received: by 10.84.179.3 with SMTP id a3mr3019487plc.480.1501857176962; Fri, 04 Aug 2017 07:32:56 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1501857176; cv=none; d=google.com; s=arc-20160816; b=0S4+3vT6iRid75IeBgiG4SZO2guHlPC7Y6anSq4yLzWBn5kXlUxdVHi7RF4bLpzq4J 5uE10UnQQYFOnMOuYQouIjCwdsuC8cd9SfuYsAKue2gPSJw5IQ8ydRaiNTzq3nslnEjZ MeDAH0EZWtohgkxziXFqR7HsrohPEYGmjcDgPXvRbtpd/efk6WB91yDAlnllt/osh1mK eNQrhs7HXZicId59Zc2/taZS1h3fqhZGBo0+OC1YvR1QZBEvPqd5rfr93ov7fIFX0cQS TFxVF61KKhdBZTRS5/epEZV4x//xbG34SzFnJsHf6XU07+o80jLRBn4i54Sxidxn9xbS 0DEw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=tlo+gzgh/urBxyot8f4WR4Jr2fka1/3C0W5afTUkxhs=; b=Zgkj7lMz+12caLIDiMGH84cBLmJg8TIAlxcKAHcdQexmoIISQdiLzGFhHHGXkYrmG6 q7mAbsmApK3pHnIwjLHmtc8BnIkU085SGOZy6INqmc/QzstHBTPy92cQIwunhyaMQTse j0YV455SWjCJtFLJ+g85S0ZXMrh1TvcjPKEUNIO53PPBBNnWbJXhIu52rXSr/6bSbBco de8QdafJMkX6FmzI36pA4WIZ7FmwWi2nlH/KjrIvParPqNeX+n51nZrODjXnXM+j0H5k VenZ7fidxHGLNNl3zZOqDrAtozqE6oq6m6qQwr4ICBn1yknleFEGzploMIuk/Jr0QXU5 92YA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id j3si1223362pld.53.2017.08.04.07.32.56; Fri, 04 Aug 2017 07:32:56 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752853AbdHDOcx (ORCPT + 25 others); Fri, 4 Aug 2017 10:32:53 -0400 Received: from foss.arm.com ([217.140.101.70]:54512 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752594AbdHDOcu (ORCPT ); Fri, 4 Aug 2017 10:32:50 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8F95315BF; Fri, 4 Aug 2017 07:32:49 -0700 (PDT) Received: from e107155-lin.cambridge.arm.com (unknown [10.1.210.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 04B813F3E1; Fri, 4 Aug 2017 07:32:46 -0700 (PDT) From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Roy Franz , Harb Abdulhamid , Nishanth Menon , Arnd Bergmann , Loc Ho , Alexey Klimov , Ryan Harkin , Jassi Brar , "Rafael J. Wysocki" , Viresh Kumar , linux-pm@vger.kernel.org Subject: [PATCH v2 18/18] cpufreq: scmi: add support for fast frequency switching Date: Fri, 4 Aug 2017 15:31:44 +0100 Message-Id: <1501857104-11279-19-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1501857104-11279-1-git-send-email-sudeep.holla@arm.com> References: <1501857104-11279-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The cpufreq core provides option for drivers to implement fast_switch callback which is invoked for frequency switching from interrupt context. This patch adds support for fast_switch callback in SCMI cpufreq driver by making use of polling based SCMI transfer. It also sets the flag fast_switch_possible. Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Cc: linux-pm@vger.kernel.org Signed-off-by: Sudeep Holla --- drivers/cpufreq/scmi-cpufreq.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) -- 2.7.4 diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index 034359cafea5..cb1084cb1ef1 100644 --- a/drivers/cpufreq/scmi-cpufreq.c +++ b/drivers/cpufreq/scmi-cpufreq.c @@ -61,6 +61,19 @@ scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) return perf_ops->freq_set(priv->handle, priv->domain_id, freq, false); } +static unsigned int scmi_cpufreq_fast_switch(struct cpufreq_policy *policy, + unsigned int target_freq) +{ + struct scmi_data *priv = policy->driver_data; + struct scmi_perf_ops *perf_ops = priv->handle->perf_ops; + + if (!perf_ops->freq_set(priv->handle, priv->domain_id, + target_freq * 1000, true)) + return target_freq; + + return CPUFREQ_ENTRY_INVALID; +} + static int scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { @@ -164,6 +177,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) policy->cpuinfo.transition_latency = latency; + policy->fast_switch_possible = true; return 0; out_free_cpufreq_table: @@ -180,6 +194,7 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy) { struct scmi_data *priv = policy->driver_data; + policy->fast_switch_possible = false; cpufreq_cooling_unregister(priv->cdev); dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); dev_pm_opp_cpumask_remove_table(policy->related_cpus); @@ -228,6 +243,7 @@ static struct cpufreq_driver scmi_cpufreq_driver = { .init = scmi_cpufreq_init, .exit = scmi_cpufreq_exit, .ready = scmi_cpufreq_ready, + .fast_switch = scmi_cpufreq_fast_switch, }; static int scmi_cpufreq_probe(struct platform_device *pdev)